With the rapid development of China's machinery industry, the use of motor controller is also more and more, we almost can not do without the use of it, according to the different work environment we application equipment is also different, brushless dc motor controller and the application of ac induction motor controller is very much also, we should be how to distinguish when choose, choose the suitable one device directly? Compared to brushless dc motor controller for ac induction motor controller structure more simple, less noise, maintenance more easy. 1. Speed/torque characteristics: brushless dc motor controller: flat --Under the condition of rated load, can be in all speed under normal work. Ac induction motor controller: nonlinear --Under low speed torque is low. 2. The output power/volume: brushless dc motor controller: high --The adoption of permanent magnet rotor, for a given output power can be smaller volume. Induction motor controller: medium --Because of the stator and rotor winding, the output power and the ratio of the volume below the BLDC. Motors3. Rotor inertia: brushless dc motor controller: small --The dynamic transformation. Induction motor controller: --Poor dynamic characteristics. 4. Starting current rating --No special start-up circuit. Is the rating of about 7 times-Should be careful to choose appropriate starting circuit. 5. Control requirements: the former must keep motor controller, operation always need controller, also can use this controller to control speed. The latter fixed speed don't need the controller, only need to need to change the speed tachometer. 6. Difference frequency: brushless dc motor controller: the frequency of the stator and rotor magnetic field is equal. Rotor of the induction motor controller: operating frequency is lower than the stator, the difference is the difference frequency, as the motor controller the difference frequency increases with the increase of the load. From multiple aspects of brushless dc motor controller and ac induction motor controller was carried out. Can see obviously, brushless dc motor controller where both were superior to the latter, on the one hand a new type of brushless motor controller called electronic commutator dc motor controller, it overcomes the defect of the first generation of brushless motor controller. So it also get more use, use more widely. Small make up: Sara
